Hadhrat `Amr Ibn Al-Aas Radhiallaahu `Anhu delivered the Friday Khutbah and said, Abu Basrah (Radhiallaahu `Anhu) narrated to me that Nabi Sallallaahu `Alayhi Wa Sallam said: “Indeed Allaah has added for you a Salaah, and that is Witr, so perform it between (the times of) `Ishaa Salaah and Fajr Salaah.” – Musnad of Imaam Ahmad Rahimahullaah. [i]

Based on the above Hadeeth Imaam Al-Margheenaanee Rahimahullaah says in Al-Hidaayah: “This is a command of compulsion (i.e. Waajib), therefore it is compulsory to perform Qadhaa of it according to consensus.”[ii]